Kopsia is a genus of flowering shrubs and trees in the family Apocynaceae (the dogbane family), belonging to the order Gentianales. The genus was first formally described in 1823 by the Dutch botanist Carl Ludwig Blume, and currently comprises around 25 accepted species according to Plants of the World Online.
Members of Kopsia are evergreen woody plants ranging from large shrubs to small trees. Kopsia arborea, one of the most widespread species, grows up to 14 metres tall with grey bark, white-corollaed flowers, and blue-black ellipsoid fruits up to 4.2 centimetres long. Kopsia fruticosa is a notable ornamental shrub prized for its purplish, fragrant flowers with a distinctive grape-like scent. As members of Apocynaceae, Kopsia species typically produce milky latex and flowers with a characteristic tubular corolla.
The genus is native to southern China, Southeast Asia, northern Australia, and various islands of the western Pacific, with its greatest diversity concentrated in the Malesian region — particularly the Malay Peninsula, Borneo, and Sumatra. Species ranges extend from Thailand and Indochina through the Indonesian archipelago to the Solomon Islands, Vanuatu, and Micronesia. Kopsia arborea has the broadest range, occurring from the Andaman and Nicobar Islands through continental Southeast Asia to northern Australia, at elevations from sea level to 1,500 metres.
Notable species include Kopsia fruticosa (widely cultivated as an ornamental), Kopsia arborea (the most geographically widespread), Kopsia singapurensis (endemic to Singapore and peninsular Malaysia), and Kopsia angustipetala (restricted to Thailand and Laos). Traditional medicinal uses have been recorded across the genus range; in China, K. arborea has been used as an enema and as a treatment for tonsillitis.
Etymology
The genus name Kopsia honours Gerrit Kops (1779–1849), a Dutch botanist and pharmacist; the genus was described by Carl Ludwig Blume in 1823.
Distribution
Kopsia is native to southern China (including Hainan), mainland Southeast Asia (Thailand, Laos, Vietnam, Myanmar), the Malay Peninsula, Borneo, Sumatra, the Philippines, New Guinea, the Solomon Islands, Vanuatu, Micronesia, the Andaman and Nicobar Islands, and northern Australia. The greatest species diversity is concentrated in the Malesian biogeographic region, particularly the Malay Peninsula and Borneo, where the majority of the approximately 25 known species occur.
Ecology
Kopsia arborea occurs across a wide altitudinal range, from sea level to approximately 1,500 metres, in diverse habitats across its range from the Andaman Islands to northern Australia. Kopsia fruticosa is cultivated as an ornamental shrub for its fragrant purplish flowers. Members of Apocynaceae characteristically produce alkaloids, and medicinal uses are recorded for at least K. arborea in Chinese traditional medicine.
